Final answer:
RNA Polymerase is the enzyme that copies a gene into mRNA, with different types in prokaryotes and eukaryotes.
Explanation:
RNA Polymerase is the enzyme responsible for copying a gene into a piece of mRNA. In prokaryotes, the same RNA polymerase is used to transcribe all genes. There are three types of RNA polymerases in eukaryotes: RNA polymerase I, RNA polymerase II, and RNA polymerase III, each with specific functions.
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